Add try/except blocks to setup course hook

[jgwerner]

Closes #569

[codecov]

Codecov Report

Merging #570 (ba000b3) into main (907e6c5) will decrease coverage by 0.96%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main     #570      +/-   ##
==========================================
- Coverage   75.59%   74.63%   -0.97%     
==========================================
  Files          15       15              
  Lines        1008     1025      +17     
==========================================
+ Hits          762      765       +3     
- Misses        246      260      +14     

Impacted Files	Coverage Δ
src/illumidesk/illumidesk/apis/jupyterhub_api.py	56.03% <0.00%> (-4.16%)	⬇️
...umidesk/illumidesk/authenticators/authenticator.py	87.87% <50.00%> (-2.60%)	⬇️

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[Abhi94N]

LGTM